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Previous studies have shown that the elastic properties of ZincDialkyl-dithiophosphate (ZDTP) tribofilms measured by nanoindentation increaseversus applied pressure (Anvil effect) [1, 2]. The aim of this paper is todemonstrate that, up to 8 GPa, this increase is a reversible phenomenon. A ZDTPtribofilm has been produced on "AISI 52100" steel substrate using aCameron-Plint tribometer. After its formation, a hydrostatic pressure of about8 GPa was applied during one minute on the tribofilm using a large radius steelball ("Brinell-like" test). Nanoindentation tests were performed with aBerkovich tip on pads in order to measure and compare the mechanical propertiesof the tribofilm inside and outside the macroscopic plastically deformed area.Careful AFM observations have been carried out on each indent in order to takeinto account actual contact area. No difference in elastic properties wasobserved between the two areas: tribofilm modulus and pressure sensitivity arethe same inside and outside the residual hemispherical print. This demonstratesthat Anvil effect is a reversible phenomenon in the studied pressure range.

Effect of hydrostatic pressure on elastic properties of ZDTP tribofilms